The sinister-sounding term "shadow banning" has been in play recently, mostly thanks to conservatives — including President Donald Trump — accusing Twitter and other technology companies of political bias.

"Twitter 'SHADOW BANNING' prominent Republicans. Not good. We will look into this discriminatory and illegal practice at once! Many complaints," the president tweeted on July 26. (His tweet was not accurate.)

Here's a look at shadow banning and why it's now a political issue.

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